Just bought a 881D PowerMaster with odd powersteering...

I ran across & bought this 881-D powermaster today, it has the tool box behind the running board, it has great power-steering but it has only one cylinder on one side, but it has full mechanical steering also. (two steering arms). It doesn't look factory, but the pump fits perfectly.

I couldn't find the serial number - I think acid has messed it up...the selecto-speed worked great in all gears (although the steering was a little sloppy at higher speeds) - three point was very strong, sheet metal is in good shape (except mising lower grille), but the PTO is on all the time! It shifts from high to low, but there's no lever to disengage the PTO...

I know nothing about selecto-speeds, if anyone can help me out with advice, things to look out for, any manuals (other than what is covered in the basic 55-59 service manual), I would really appreciate it!